Passing API key in header returns 400 for certain endpoint

[AlbinLind]

OS & Hardware Ubuntu Server 22.04.5 LTS

Version 0.22.3

Describe the bug The endpoint /api/v1/countries/visited_cities returns 400 when the parameter api_key is not passed (i.e. passed through header).

To Reproduce Make a request to the endpoint with the API key in the header instead of the url.

Expected behavior Return all visited cities per country, and return 200 status code

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